What are the names of animals with thorns, such as what? What is the name of an animal without a spine?

Spiny animals are called vertebrates); ; It refers to animals with backbones, a subfamily of Chordata. Including roundmouth, fish, amphibians, reptiles, birds and mammals. For example: ducks, sparrows, pigeons, geese, parrots, etc. Tortoise, chameleon, crocodile, etc.

Animals without backbones are called invertebrates); ; It is an animal with no spine on its back, and it is the primitive form of the animal. Including protozoa, echinoderms, mollusks, flatworms, annelids, coelenterates, arthropods, linear animals and so on. For example: foraminifera, radiolarians, jellyfish, corals, squid and echinoderms.

Extended data:

1, with the characteristics of vertebrates:

Most of the muscles we have are paired muscles. Part of the nervous system is in the middle of the spine. Vertebrate bones are internal bones, including cartilage and hard bones. With the growth of animals, bones support the shape of the body. Therefore, vertebrates can grow bigger than invertebrates, and their average body mass is also relatively large.

2, the characteristics of invertebrates:

Most of them are very small, but molluscs are cephalopods, with a body length of 18m and a wrist length of 1 1m, weighing about 2 tons. Most invertebrates are aquatic, most marine products, such as foraminifera, radiolaria, jellyfish, corals, squid and echinoderms, are marine products, and some species live in fresh water, such as hydra, some snails, mussels and freshwater shrimps and crabs.

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